Experimental Study Of A New Model Of Saline Soil Subgrade Structure In The Southern Xinjiang

Saline Soil subgrade located in multi-field coupling system of solid–liquid–temperature willinevitably produce the enrichment of salt and salt expansion phenomenon, leading to thedestruction of roads. This study is the new subgrade structure suiting saline soil road based on themulti-field coupling theory of solid-liquid-temperature, whicn conduct the research on saline soilsubgrade barrier layer and drainage layer and committing to solving salt-frost heave、melt sinking andmudding etc. road damage of saline soil in the southern Xinjiang，to improving the service life and roadservice quality of saline soil road。This paper should have to carry out site investigation of critical damage depth of saline soil subgradeand conduct sampling in typical section and do some concerned experiments including density, watercontent, consolidation test, direct shear test and etc. which will prepare for the follow-up test. In the studyof best shape of salt discharge model for saline soil roadbed in South Xinjiang，in order to determine theoptimal barrier layer slope under subgrade suiting salt discharge, according to the model and the actualsubgrade’s similarity ratio1:100of long、wide and high，we designed and manufactured the glass model。We can determine the optimum slope for salt discharge accoording to salt discharge’ effect of the salinesoil subgrade in the simulated rainfall by changing barrier layer’ slope in saline soil subgrade’ structure andadding water channel under the barrier layer and achieving salt discharge amount of the subgrade structurein the corresponding barrier layer’ slope through the analysis of salt composition of the percolating solutionin the water channel。In the study of salt expansion and salt discharge measures for new saline soil subgradein South Xinjiang, according to the model and the actual subgrade’ similarity ratio1:12of long、wide、high and drainage ditch size，we designed and manufactured wooden model of subgrade. Consideringthe conditions of the rainfall and high-low temperature cycling, by using the similarity principle weconducted indoor model test and achieved the salt migration、 salt-frost heave deformation and saltdischarge effect。We conducted comprehensive evaluation to the structure and performance of the newsubgrade。...